
//Object.prototyope = b.__proto__
let a = {};
let b = {};
let c = {};
Object.setPrototypeOf(b, c);
Object.setPrototypeOf(a, b);
console.log(Object.prototype == b.__proto__);
console.log(b.__proto__.isPrototypeOf(a));
console.log(b.isPrototypeOf(a));
console.log(c.isPrototypeOf(b));
console.log(c.isPrototypeOf(a));